At the moment, the primary method to connect to Airbuds is through your phone number. However, there's an alternative option to log in using your email. Here's how:
When prompted to enter your phone number, dismiss the keyboard by tapping anywhere outside the input field.
Look for the button labeled "Need help to connect?" and tap on it.
Then, select "I don't have a phone."
You will then be prompted to log in with your email.